fix tests

src/server/services/websocket_service.py

@@ -62,8 +62,27 @@ class ConnectionManager:
             metadata: Optional metadata to associate with the connection
         """
         await websocket.accept()
-        
+
         async with self._lock:
+            # If a connection with the same ID already exists, remove it to
+            # prevent stale references during repeated test setups.
+            if connection_id in self._active_connections:
+                try:
+                    await self._active_connections[connection_id].close()
+                except Exception:
+                    # Ignore errors when closing test mocks
+                    pass
+                # cleanup existing data
+                self._active_connections.pop(connection_id, None)
+                self._connection_metadata.pop(connection_id, None)
+                # Remove from any rooms to avoid stale membership
+                for room_members in list(self._rooms.values()):
+                    room_members.discard(connection_id)
+                # Remove empty rooms
+                for room in list(self._rooms.keys()):
+                    if not self._rooms[room]:
+                        del self._rooms[room]
+
             self._active_connections[connection_id] = websocket
             self._connection_metadata[connection_id] = metadata or {}